Exam 3 material

Overview

  • This document outlines key concepts and details related to enzymatic actions, drug design, and various biochemical mechanisms as reviewed after test two.

Ping Pong Mechanism

  • Definition and focus on the ping pong mechanism as the next study topic.

  • Importance in the context of enzymatic reactions and drug design.

Residential Drug Design and Nonclassical Enzymes

  • Discussion on how certain drugs are designed in relation to nonclassical enzymes.

  • Emphasis on their effects on human health.

Mechanism of Enzymatic Actions

  • Detailed exploration of the mechanism of enzymatic actions.

    • ES Complex (Enzyme-Substrate Complex):

    • Factors affecting the stability of the ES complex.

    • Transition from ES complex to EX* (transition state).

    • Statement: Stability of EX* is much greater than that of the ES complex.

    • Experimental proofs required to validate this statement.

Factors Affecting Stability

  • Discussion of various factors affecting the stability of the ES complex.

  • Comparison of stability between EX* and ES complex.

Drug Design and Stability

  • Explanation of recent drug designs aimed at maximizing stability of the EX* complex.

Types of Catalysis

  • Identification of three primary types of catalysis:

    • Covalent Catalysis

    • Acid-Base Catalysis

    • Metal Ion Assisted Catalysis

  • Importance of knowing applications for each type of catalysis.

Families of Enzymes

  • Serine Proteases:

    • Defined as a triad center with a charge relay mechanism.

    • Three important amino acids needed for the catalytic center:

    • Serine

    • Histidine

    • Aspartate

    • Effects of amino acids on specificity, using trypsin, chymotrypsin, and elastase as examples.

    • All have the same structure, differences lie in SBS (side chain binding sites).

Diet Center and HIV

  • Discussion on the diet center and its relevance in HIV mechanics—highlighting how HIV utilizes this mechanism.

Regulation of Enzymatic Activity

  • Exploration of how enzymes are regulated, including:

    • Concentration of enzymes.

    • Concentration of substrates.

  • Method of proving enzyme concentration via gene expression.

Proenzymes and Isozymes

  • Explanation of proenzymes and their processing.

  • Discussion on isozymes, particularly tissue-specific LDH (Lactate Dehydrogenase).

Cyclic AMP and Glycogen Degradation

  • Role of cyclic AMP as a small molecule regulating glycogen degradation mechanisms.

Blood Clotting Mechanism

  • Discussion on blood clotting and proteases involved:

    • Importance of factors I, II, XIII, and their sequential reactions in clotting processes.

Hemoglobin and Myoglobin

  • Detailed mechanisms of oxygen binding.

  • Comparison between hemoglobin and myoglobin.

  • Sickle Cell Anemia:

    • Discussion of treatments and therapeutic approaches.

  • Overview of competitive and noncompetitive inhibitors of oxygenated hemoglobin.

  • Role of 2,3-BPG (2,3-bisphosphoglycerate) in oxygen transport.

Glucose Levels and Drugs

  • Normal glucose levels in humans and relation to various pharmaceutical drugs.

Lactose Intolerance and Disaccharides

  • Mechanism of lactase in breaking down disaccharides into monosaccharides.

  • Discussion of lactase deficiency leading to lactose intolerance.

  • Relation of glucose levels:

    • Combination expressed: nimes1014extto109n imes 10^{14} ext{ to } 10^{9}.

Cellulose Structure

  • Differences in glucose linkages in cellulose (β-1,4 linkage).

  • Implications of linkage in polymer formation (millions/billions of molecules).

Modified Sugars

  • Applications of modified sugars in blood group determination, antigens structure (ABO blood types).

  • Discussion of their relevance to Gram-positive and Gram-negative bacteria, including the roles of rolling leukocytes.

Lipids

  • Two categories of lipids:

    • Complex Lipids:

    • Examined in relation to cell membranes.

    • Simple Lipids.

    • Focus on specific complex lipids: PC (Phosphatidylcholine) and PS (Phosphatidylserine).

  • Requirement to know structures of:

    • Ether glycerophospholipids (e.g., PAF - Platelet Activating Factor): definite structure and function relationship.

Sphingolipids and Related Diseases

  • Overview of sphingolipids and associated diseases due to their degradation issues:

    • Gaucher disease

    • Fabry's disease

    • Niemann-Pick disease

Steroid Biosynthesis

  • Conversion of cholesterol into steroid hormones (testosterone and estradiol).

  • Necessary pathways, enzyme locations, and byproducts to be mastered.

  • Discussion of potential consequences of defective enzymes in steroidogenesis.

Fluid Model of Cell Membrane

  • Explanation of the fluid mosaic model, including integral, peripheral, and anchor proteins.

  • Emphasis on the importance of anchor proteins in cell signaling, particularly referencing RAS oncogene's role in tumor formation.

Conclusion

  • Recap on essential topics covered including enzymatic mechanisms, drug design, lipid structures, and their biological implications.

  • Encouragement to review all material thoroughly for deeper understanding and application.

Additional Notes

  • Reminder of end-of-lecture notes and practical implications of all discussed topics.

  • Final thoughts on upcoming subjects and their relevance to overall biochemistry study.